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Hydraulic control device for automatic transmission

a technology of hydraulic control device and automatic transmission, which is applied in the direction of gearing elements, servomotor components, servomotors, etc., can solve the problems of reducing the amount of hydraulic oil leaking from the hydraulic control device compared with under high pressure, and the inability to further lower the line pressure, so as to improve the fuel economy of the vehicle, reduce the friction torque of the automatic transmission, and reduce the driving torque of the oil pump

Active Publication Date: 2009-11-19
HONDA MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a hydraulic control device for an automatic transmission of a vehicle that can reduce driving torque and friction torque, thus improving fuel economy. This is achieved by switching the line pressure generated by the regulator valve to low pressure, reducing the amount of lubricating oil and the amount of friction torque in the transmission. The hydraulic control device includes a regulator valve, a relief valve, and a line pressure switching section that can switch the line pressure to low pressure when the engagement hydraulic oil pressure does not require high engagement hydraulic oil pressure. The control valve can be located in the lubricating oil passage or the line pressure oil passage. Overall, this hydraulic control device allows for improved fuel economy in vehicles equipped with an automatic transmission.

Problems solved by technology

However, the line pressure can be increased using stator reaction force as described above, but it is impossible to further lower line pressure compared with normal line pressure, to which the stator reaction force is not applied, in a region in which a function and merchantability of the automatic transmission can fully be satisfied even under lower line pressure than normal.
For this reason, there has been a problem that it is impossible to further improve fuel economy of a vehicle by further lowering line pressure in such a vehicle with the automatic transmission.
However, as shown in FIG. 2B, when line pressure is set to low pressure, the amount of hydraulic oil leaking from the hydraulic control device falls compared with under high pressure.
Thus, there has been a problem that as a result, fuel economy cannot be improved in such a case.

Method used

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  • Hydraulic control device for automatic transmission
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  • Hydraulic control device for automatic transmission

Examples

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first embodiment

[0029]A first embodiment of a hydraulic control device for an automatic transmission according to the present invention will first be described.

[0030]FIG. 3 is a schematic view of a vehicle to which a hydraulic control device for an automatic transmission according to the present invention is applied. As shown in FIG. 3, this vehicle is provided with: an engine E; a hydraulic torque converter T connected to this engine E; an automatic transmission M connected to the torque converter T; a differential Df and the like. In this regard, the hydraulic control device for the automatic transmission according to the present invention is provided in the automatic transmission M. An output of the engine E is in turn transmitted to the torque converter T, the automatic transmission M and the differential Df via the crank shaft 1, and is finally transmitted to driven wheels W, W′.

[0031]As shown in FIG. 3, the torque converter T is constructed from: a pump impeller 2 connected to the crank shaft...

second embodiment

[0041]Next, a second embodiment of a hydraulic control device for an automatic transmission according to the present invention will be described. In this regard, since a configuration of the overall vehicle is similar to that in FIG. 3, its explanation is omitted.

[0042]FIG. 6 is a part of a hydraulic circuit diagram of a hydraulic control device for an automatic transmission according to a second embodiment of the present invention. Here, differences between the first embodiment and a second embodiment will be described mainly. The same reference numerals are assigned to components similar to those in the first embodiment described above, and detailed description thereof is omitted. In the hydraulic control device for the automatic transmission according to the present embodiment, an installation location of a control valve 14 is different from that in the hydraulic control device for the automatic transmission according to the first embodiment. Namely, in the present embodiment, th...

third embodiment

[0046]Next, a third embodiment of a hydraulic control device for an automatic transmission according to the present invention will be described. In this regard, since a configuration of the overall vehicle is similar to that in FIG. 3, its explanation is omitted as well as the second embodiment.

[0047]FIG. 7 is a part of a hydraulic circuit diagram of a hydraulic control device for an automatic transmission according to a third embodiment of the present invention. Here, differences between the first and second embodiments and a third embodiment will be described mainly. The same reference numerals are assigned to components similar to those in the first embodiment described above, and detailed description thereof is omitted. In the hydraulic control device for the automatic transmission according to the present embodiment, an installation location of a control valve 14 and the number of output ports thereof are different from those in the hydraulic control device for the automatic tr...

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PUM

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Abstract

A hydraulic control device for an automatic transmission is provided. The hydraulic control device can sets up any gear from a plurality of gears by causing any one of a plurality of frictional engagement elements to selectively carry out an engagement operation. The hydraulic control device includes: a regulator valve that regulates base oil pressure of hydraulic oil supplied from an oil pressure source; a relief valve provided in a lubricating oil passage connected from the regulator valve; and a line pressure switching section that sets up line pressure to low pressure to reduce the amount of lubricating oil in a region in which engagement hydraulic oil pressure does not require high engagement hydraulic oil pressure depending upon an operation state of a vehicle, and sets up the line pressure to high pressure when a target value of the engagement hydraulic oil pressure exceeds predetermined pressure.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]The present disclosure relates to subject matter contained in Japanese Patent Application No. 2008-131319, filed on May 19, 2008, the disclosure of which is expressly incorporated herein by reference in its entirety.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a hydraulic control device for an automatic transmission of a vehicle, and particularly, the present invention relates to a hydraulic control device for an automatic transmission that can switch line pressure of hydraulic oil between two steps.[0004]2. Description of the Related Art[0005]Heretofore, there is known a hydraulic control device for an automatic transmission that, when a load is applied to the automatic transmission, increases line pressure of a hydraulic circuit on the basis of the load compared with line pressure while stopping of the vehicle in order to improve fuel economy (gas mileage) of a vehicle provided with an ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F16H61/26
CPCF16H61/0021F16H61/0206Y10T477/6936Y10T477/69395F16H2061/0037
Inventor SHUDO, NORIMASAISHIDA, SUGURUTAMAI, MASAYAUEKI, AKIHIRO
Owner HONDA MOTOR CO LTD